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-.Dd January 26, 2016
-.Dt CLOCK_GETTIME 3
-.Os
-.Sh NAME
-.Nm clock_gettime ,
-.Nm clock_settime ,
-.Nm clock_getres ,
-.Nm clock_gettime_nsec_np
-.Nd get/set date and time
-.Sh SYNOPSIS
-.Fd #include <time.h>
-.Ft int
-.Fn clock_gettime "clockid_t clock_id" "struct timespec *tp"
-.Ft int
-.Fn clock_settime "clockid_t clock_id" "const struct timespec *tp"
-.Ft int
-.Fn clock_getres "clockid_t clock_id" "struct timespec *tp"
-.Ft uint64_t
-.Fn clock_gettime_nsec_np "clockid_t clock_id"
-.Sh DESCRIPTION
-The
-.Fn clock_gettime
-and
-.Fn clock_settime
-functions
-allow the calling process to retrieve or set the value used by a clock
-which is specified by
-.Fa clock_id .
-.Pp
-.Fa clock_id
-can be a value from
-one of 8 predefined values:
-.Bl -tag -width Er
-.It Dv CLOCK_REALTIME
-the system's real time (i.e. wall time) clock, expressed as the amount of time
-since the Epoch.
-This is the same as the value returned by
-.Xr gettimeofday 2 .
-.It Dv CLOCK_MONOTONIC
-clock that increments monotonically, tracking the time since an arbitrary
-point, and will continue to increment while the system is asleep.
-.It Dv CLOCK_MONOTONIC_RAW
-clock that increments monotonically, tracking the time since an arbitrary point
-like CLOCK_MONOTONIC.  However, this clock is unaffected by frequency or time
-adjustments.  It should not be compared to other system time sources.
-.It Dv CLOCK_MONOTONIC_RAW_APPROX
-like CLOCK_MONOTONIC_RAW, but reads a value cached by the system at context
-switch.  This can be read faster, but at a loss of accuracy as it may return
-values that are milliseconds old.
-.It Dv CLOCK_UPTIME_RAW
-clock that increments monotonically, in the same manner as
-.Dv CLOCK_MONOTONIC_RAW,
-but that does not increment while the system is asleep.
-The returned value is identical to the result of
-.Fn mach_absolute_time
-after the appropriate mach_timebase conversion is applied.
-.It Dv CLOCK_UPTIME_RAW_APPROX
-like CLOCK_UPTIME_RAW, but reads a value cached by the system at context
-switch.  This can be read faster, but at a loss of accuracy as it may return
-values that are milliseconds old.
-.It Dv CLOCK_PROCESS_CPUTIME_ID
-clock that tracks the amount of CPU (in user- or kernel-mode) used by the
-calling process.
-.It Dv CLOCK_THREAD_CPUTIME_ID
-clock that tracks the amount of CPU (in user- or kernel-mode) used by the
-calling thread.
-.El
-.Pp
-The structure pointed to by
-.Fa tp
-is defined in
-.In sys/time.h
-as:
-.Bd -literal -offset indent
-struct timespec {
-    time_t  tv_sec;     /* seconds */
-    long    tv_nsec;    /* and nanoseconds */
-};
-.Ed
-.Pp
-Only the
-.Dv CLOCK_REALTIME
-clock can be set, and only the superuser may do so.
-.Pp
-The resolution of a clock is returned by the
-.Fn clock_getres
-call.
-This value is placed in a (non-null)
-.Fa *tp .
-This value may be smaller than the actual precision of the underlying clock,
-but represents a lower bound on the resolution.
-.Pp
-As a non-portable extension, the
-.Fn clock_gettime_nsec_np
-function will return the clock value in 64-bit nanoseconds.
-.Sh RETURN VALUES
-A 0 return value indicates that the call succeeded.
-A \-1 return value indicates an error occurred, and in this
-case an error code is stored into the global variable
-.Va errno .
-For
-.Fn clock_gettime_nsec_np
-a return value of non-0 indicates success.  A 0 return value indicates an error
-occurred and an error code is stored in
-.Va errno .
-.Sh ERRORS
-.Fn clock_gettime ,
-.Fn clock_settime ,
-.Fn clock_getres ,
-and
-.Fn clock_gettime_nsec_np
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-.Fa clock_id
-is not a valid value.
-.It Bq Er EFAULT
-The
-.Fa tp
-argument address referenced invalid memory.
-.El
-.Pp
-In addition,
-.Fn clock_settime
-may return the following errors:
-.Bl -tag -width Er
-.It Bq Er EPERM
-A user other than the superuser attempted to set the time.
-.It Bq Er EINVAL
-.Fa clock_id
-specifies a clock that isn't settable,
-.Fa tp
-specifies a nanosecond value less than zero or greater than 1000 million,
-or a value outside the range of the specified clock.
-.El
-.Sh SEE ALSO
-.Xr date 1 ,
-.Xr getitimer 2 ,
-.Xr gettimeofday 2 ,
-.Sh HISTORY
-These functions first appeared
-in
-Mac OSX 10.12
-.Sh STANDARDS
-The
-.Fn clock_gettime ,
-.Fn clock_settime ,
-and
-.Fn clock_getres
-system calls conform to
-.St -p1003.1b-93 .
-.Fn clock_gettime_nsec_np
-is a non-portable Darwin extension.
-The clock IDs
-.Fa CLOCK_MONOTONIC_RAW
-and
-.Fa CLOCK_UPTIME_RAW
-are extensions to the POSIX interface.